Boiler construction.



W. F. SELLERS.

BOILER CONSTRUCTION. APPLICATION FILED Nov.25. 1914.

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Patnted Aug. 3, 1915.

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Q@@@QGQ@@@OIOQOQQQOOQQGQQOQ INVENTOR W. F. SELLERS. BOILER CONSTRUCTION. APPLICATION FILED NOV. 25| I9I4. 1,148,544. Patented Aug. 3,1915.

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C ATTORNEY COLUMBIA PLAnoGRAPH co.. WASHINGTON. D, c.

'mann srarns rarnnr onirica- WILLIAJV[.:F. HSELLERSyOF EDGEMOOR, DELAWARE, 'AVSYSIGNOR TO EDGE MOOR IRON COMPAN'lYyEfEDGET/IOOR, DELAWARE, A CORPORATION' OF=DELAEVARE .BOILER CONSTRUCTION.

iguanas.

To all whom t'mag/ concern.'

'Be it known that'l, TILLIAM F. Semaine,

a citizen of the United States, residing in' Edgemoor, 'Brandywine Hundred, county of yNew Castle,A and State of Delaware, have inventeda certain new and useful lmprove lment in Boiler Construction, of which the following isl=a true yand exact description, reference being had to the accompanying drawings, whichform a part thereof.

The general object of mypresent invention is to improve the construction of the headers of rsteam 'generating boilers and like structures in which a chamber wall subjectedto internal pressure, is formed with handl hole openings spaced comparatively closelytogether and has'stay bolts attached to it between the hand holes. p

More specifically one object of my invention'isto shape the wall containing the hand holes so as to lstrengthen the latter, `and so as to directly utilize the strength and rigidity of hand hole covers having tapered or conical 'portions entering the hand hole openings vfrom their inner ends and plug ging` said openings strengthening the wall containing the hand hole openings.

Other specific objects of inventionare to provide a wall construction shaped to effect the first mentioned specific object of my invention with Aseats adaptedto receive and accurately positionv the external dogs by which 'the hand hole covers are secured in place,`and which will permitthe hand `hole cover seats to'be readily and inexpensively formedin -a very accurate manner.

In carrying out my invention I forge or die press the plate or wall containing the hand hole openings to forminternal flanges surrounding the hand hole openings and providing the seats for the conical plug portions ofthehand "hole covers. These `flanges are merged into the flat portion of the wall to which the stay bolts are attached so that the portions of each pair of flanges at 0pposite sides of any stay bolt, form in effect the sides of a more or less flat arch to the crown of which the stay bolt is attached.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention however, and the advantages possessed by it, reference should be had to the ae;

fspecication of Letters Patent.

:Patented Aug. a, i915.

Serial No. 873,851.

companying drawings and descriptive matter in which I have illustrated and described a preferred construction embodying my invention.

Of the drawings: Figurel is a front elevation of a portion of a watervtube boilerv in which my invention is employed. Fig. 2 is a .partial section on the line Q2 of Fig. l. Fig. '3 is a'partial horizontal section on the line 3--3 of Fig. l. Fig. 4 is a partial vertical. section on thc line /l-ll of Fig. l. Fig. 5 is a partial inclined section on the line 5 5 of Fig. l.

'In the "drawings, Arepresents the front header of water tube boiler land B represents the water tubes thereof. C is the steam-and water boiler.

The header A is formed with substantially" parallel front and back walls@ and mrcspectively. `The water tubes B which pass through apertures formed in the rear wall (m are expanded to rigidly secure them in the latter. The front header wall a is formed with round hand holes A1 one in line with each water tube B. The wall or plate t is forged or'die pressed to provide a flangel portion A2 at the margin of each handhole opening as is shown clearly in Fig. 3. YEach flange portion appears as a reverse curve in cross section radial to the hand hole opening, the curve merging at its innerl endv into one of the flattened` portions of the wall (z in which plate the hand hole openings proper are formed, and merging drum of tl e at its outer end into the outer flat portion v of the'plate a to which arel attached the outer ends of the stay boltsD employed to connect the walls a and fm. Preferably as shown,` eachhandhole opening A1 is slightly flared at its inner end. Each handY hole opening is closed by means of a hand' holecover F comprising a conical portion F1 which, with the surrounding flexible bushing E of copper or the like, projects into the inner end of and fills the hand hole opening. The base of the hand hole cover is larger in diameter than the hand hele opening except at opposed sides F1, F1, where it is flattened to permit of the edgewise passage of the hand hole cover through the hand hole opening. The hand hole cover construction dis- Y closed is that coveredby the Sellers & Bradford patent 1,105,212,granted July 28, 1914. Each hand hele cover is formed on .its

outer side with a threaded socket to receive Y bolttoprevent a rotation ofthe hand hole ing and coverV is secured to the externalv dome shaped i dog The forging or die pressing of the plate to foi-in the flange portions A? is advantageously so carried out to recessed seat A3 at the margin of the outer end of each handhole opening for the cor responding dog H. Advantageously also, each hand hole cover isV formed with a fini ger F2 adapted to engage an adjacent stay cover when a wrench is applied to a nut at the outer endiof the bolt Gr to remove or tighten up thehand hole cover.

In the formation of a header such as the one illustrated in the drawings, the plate forminofthe wall t is preferably punched and flanged, and the tube and hand hole openings are bored or reamed usually in the same setting of the boring or rearning machine and before the plate is riveted into the header. v After the walls of the header are Vriveted together, the inner end of each hand vhole opening is advantageously iinished to the shape requisite for the hand h ole cover. This treatment of the hand hole seats as theiinal steps in the manufacture of theheader avoids all possibility of disA tortion of the seats due to strains in the inetal set up yduring the construction of the header." y

The construction described is simple and effective and insures an accurate formation of the seat foreach hand hole cover F, and the accurate seating of the dog H by which the hand hole cover is secured Yin place.

The flanges A1 and AA2 directly contribute to the strength of the wall a required to resist the tendency tolrupture or distort the plate at the margin of each hand hole openthe point Vof attachment to each stay bolt and indirectly strengthensv the plate by its reaction against the portions of the hand :hole covers which plug the hand hole "openings y By referring to Figs. 3' and 4 of the drawings itiwill be apparent that each hand hole f cover serves as the key-stone or crown portion of a donie,"the remainder of which is.

Copiesiof this-patent may be obtained for provide a formed by the surrounding flange portion A2. Reference to these figures' also shows thatthe adjacent portion'sof each pair of flanges al at opposite'sides .of each stay bolt form the `sides of an arch to the iiattened crown of which the stay bolt is attached.

The spreading vapart of the sidesof this arch is directly opposed, of course, by the corresponding hand hole covers F. The flatness of the archesV depends on the spacing of the hand holes, andr with the spacing shown the arches shownin vertical section are flatter than those shown in horizontal section as is Vclearly shown by Figs. 3 and 4. Having now described rny invention, what l claim as new and desire -to secure Vby Let# ters Patent is: A

1. A boiler header comprising an opposing pair of walls one of :which is formed with a plurality ofhand hole openings and with internal flanges surroundingv said openings, and in v.combination therewith stay bolts connecting said walls andv secured to the wall in which the hand holes are formed betweenV the latter, and hand hole covers comprising tapered plug portions which enter and )am in said hand hole openings from the interior of the header. 'v y .Y A boiler header comprising an opposing pair of walls one of which-is formed` with a plurality of hand-hole openings and Y vwithrinternal flanges surrounding said openings and with an external recessed seat surrounding each hand hole, and-in combination therewith stay bolts connecting said walls and seciii'edrto the wall in which the hand'v holes are formedY between the latter, handhole covers comprising tapered plug portions which enter and jam in said handl hole openings, from the interior of the header, and hand hole cover securing means comprising` an external `clamping dogor follower connected toieach cover and shaped to-engage andv be centered-,by the correspending seat.

l NVM. F.- SELLERS. .i

Vlitnesses: Y f

ARNOLD KATZ, Y D. STEWART.

five cents earch, byaddressing the Commssionerof Patents.; Y Washington, D.C.f Y j. i 

